固有模态函数振动传递率损伤识别实验研究

针对风荷载、地震荷载等存在但难以精确量测的问题,提出一种无需量测外荷载的新的损伤识别方法。将经验模态分解(Empirical Mode Decomposition,EMD)应用于结构损伤识别,通过求振动响应信号固有模态函数(Intrinsic Mode Function,IMF)的振动传递率,构建了一种新的结构损伤识别参数。对预置不同程度开胶损伤的玻璃幕墙试件进行动态测试,得到不同损伤程度下玻璃幕墙的固有模态函数振动传递率,与无损伤条件下的固有模态函数振动传递率进行比较来识别和评估玻璃幕墙开胶损伤程度。研究表明:此方法无需量测外荷载也能识别结构损伤,损伤参数值能反映损伤大小。     

环糊精与两种有机物的包合物的不同光解特性

The effectiveness of the solubilization and photodegradation of β-cyclodextrin （β-CD） and hydroxypropyl-β- cyclodextrin （HPCD） on two hydrophobic organic compounds （HOC） of methyl parathion and pentachlorophenol was investigated. The results indicate that the solubilization or photodegradation of two HOC were influenced by complexing with β-CD or HPCD. The solubility of pentachlorophenol （PCP） was increased linearly with β-CD concentration. The solubility of methyl parathion （MPT） was increased with the increase of β-CD concentration initially, however, as the β-CD concentration was enhanced above 3 g/L, the solubility was decreased with increase of β-CD concentration. The solubilities of two HOC were increased linearly with the increase of HPCD concentration. Although the photodegradation of MPT was improved, the photodegradation of PCP was restrained by complexation of HOC with β-CD or HPCD. In a word, the effectiveness of photodegradation or solubilization of HPCD was more significant than that of β-CD. One potential application of such a method was the in situ remediation of hydrophobic organic pollutants in contaminated soil and groundwater or industrial waste streams.     

β-环糊精及其衍生物对两种农药的不同光解特性

研究了β-环糊精(β-CD)及其衍生物羟丙基-β-环糊精(HPCD)对两种疏水性有机农药(甲基对硫磷和五氯酚)的增溶作用和光解影响．实验结果表明，对农药的增溶作用或光解的影响主要是由于农药与β-CD或HPCD形成包合物而引起的．β—CD能提高五氯酚的水溶性，但对甲基对硫磷的增溶作用表现为低浓度促进溶解而高浓度抑制溶解；HPCD则能显提高两种疏水性农药的水溶性．β—CD及HPCD与甲基对硫磷形成包合物，选择性定向客体分子而促进其光解；与五氯酚形成稳定的包合物，能保护客体分子而抑制其光解．HPCD对农药的增溶效果和光解的影响比β—CD更显．